×

Torque oscillation compensation utilizing battery current sensing

  • US 5,350,989 A
  • Filed: 05/13/1993
  • Issued: 09/27/1994
  • Est. Priority Date: 05/13/1993
  • Status: Expired due to Term
First Claim
Patent Images

1. A torque oscillation compensation system for use with a power source, an electric motor and a controller coupled between the power source and the motor, said system comprising:

  • an input source for providing a motor phase current amplitude command input signal for causing the controller to drive the motor;

    a summing device having an output and having a first input coupled to the input source for receiving the motor phase current amplitude command input signal and having an output coupled to the controller;

    current sensing means coupled to the power source for sensing the current supplied by the power source;

    a low pass filter coupled to the current sensing means for coupling a DC component of the current from the power source;

    an error amplifier having a first input coupled to the low pass filter and having a second input coupled to the resistor and having an output coupled to a second input of the summing device and wherein the error amplifier generates a compensation signal that is combined with the motor phase current amplitude command input signal that stabilizes the current from the power source to a DC level and thus compensates for torque oscillations present in the electric motor and thereby eliminate motor torque fluctuations;

    a resistor coupled to the current sensing means for coupling the current from the power source to the error amplifier;

    an impedance coupled in a feedback manner between the output of the error amplifier and a selected input of the error amplifier that determines a complex gain for the error amplifier.

View all claims
  • 15 Assignments
Timeline View
Assignment View
    ×
    ×